# std::flat_map<Key,T,Compare,KeyContainer,MappedContainer>::rend, std::flat_map<Key,T,Compare,KeyContainer,MappedContainer>::crend

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< cpp‎ | container‎ | flat map

reverse_iterator rend() noexcept; | (1) | (since C++23)
const_reverse_iterator rend() const noexcept; | (2) | (since C++23)
const_reverse_iterator crend() const noexcept; | (3) | (since C++23)

Returns a reverse iterator to the element following the last element of the reversed `flat_map`. It corresponds to the element preceding the first element of the non-reversed `flat_map`. This element acts as a placeholder, attempting to access it results in undefined behavior.

### Parameters

(none)

### Return value

Reverse iterator to the element following the last element.

### Complexity

Constant.

### Example

Run this code

    #include <chrono>
    #include <iomanip>
    #include <iostream>
    #include <string_view>
    #include <flat_map>

    using namespace std::chrono;

    int main()
    {
        const std::flat_map<year_month_day, int> messages
        {
            {February/17/2023, 10},
            {February/17/2023, 20},
            {February/16/2022, 30},
            {October/22/2022, 40},
            {June/14/2022, 50},
            {November/23/2021, 60},
            {December/10/2022, 55},
            {December/12/2021, 45},
            {April/1/2020, 42},
            {April/1/2020, 24}
        };

        std::cout << "Messages received (date order is reversed):\n";
        for (auto it = messages.crbegin(); it != messages.crend(); ++it)
            std::cout << it->first << " : " << it->second << '\n';
    }

Possible output:

    Messages received (date order is reversed):
    2023-02-17 : 10
    2022-12-10 : 55
    2022-10-22 : 40
    2022-06-14 : 50
    2022-02-16 : 30
    2021-12-12 : 45
    2021-11-23 : 60
    2020-04-01 : 42

### See also

rbegincrbegin | returns a reverse iterator to the beginning (public member function)
rendcrend (C++14) | returns a reverse end iterator for a container or array (function template)

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